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<a href="qtokenbucket_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/******************************************************************************</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * qLibc</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Copyright (c) 2010-2015 Seungyoung Kim.</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * All rights reserved.</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> *</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> * modification, are permitted provided that the following conditions are met:</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> *    this list of conditions and the following disclaimer.</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> *    this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> *    and/or other materials provided with the distribution.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> *</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot;</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"> * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="comment"> * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="comment"> * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="comment"> * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment"> * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="comment"> * POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment"> *****************************************************************************/</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment"></span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment">/**</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"> * @file qtokenbucket.c Token Bucket implementation.</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment"> *</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"> * Current implementation is not thread-safe.</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment"> *</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"> * More information about token-bucket:</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment"> *   http://en.wikipedia.org/wiki/Token_bucket</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"> *</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"> * @code</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"> *   qtokenbucket_t bucket;</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> *   qtokenbucket_init(&amp;bucket, 500, 1000, 1000);</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> *   while (1) {</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> *     if (qtokenbucket_consume(&amp;bucket, 1) == false) {</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> *       // Bucket is empty. Let&#39;s wait</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> *       usleep(qtokenbucket_waittime(&amp;bucket, 1) * 1000);</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"> *       continue;</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> *     }</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> *     // Got a token. Let&#39;s do something here.</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> *     do_something();</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> *   }</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> * @endcode</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> */</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span> </div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="preprocessor">#include &quot;extensions/qtokenbucket.h&quot;</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="preprocessor">#include &lt;stdbool.h&gt;</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="preprocessor">#include &lt;sys/time.h&gt;</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="preprocessor">#include &quot;utilities/qtime.h&quot;</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="preprocessor">#include &quot;qinternal.h&quot;</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="preprocessor">#ifndef _DOXYGEN_SKIP</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment">/* internal functions */</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="keyword">static</span> <span class="keywordtype">void</span> refill_tokens(qtokenbucket_t *bucket);</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"></span> </div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment">/**</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * Initialize the token bucket.</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> *</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> * @param init_tokens</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> *      the initial number of tokens.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * @param max_tokens</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> *      maximum number of tokens in the bucket.</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> * @param tokens_per_sec</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> *      number of tokens to fill per a second.</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> */</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"><a class="line" href="qtokenbucket_8c.html#a8da36d9c0f027f0a24086526593e2eab">   76</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="qtokenbucket_8c.html#a8da36d9c0f027f0a24086526593e2eab">qtokenbucket_init</a>(qtokenbucket_t *bucket, <span class="keywordtype">int</span> init_tokens, <span class="keywordtype">int</span> max_tokens,</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>                       <span class="keywordtype">int</span> tokens_per_sec) {</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>    memset(bucket, 0, <span class="keyword">sizeof</span>(qtokenbucket_t));</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>    bucket-&gt;tokens = init_tokens;</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>    bucket-&gt;max_tokens = max_tokens;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>    bucket-&gt;tokens_per_sec = tokens_per_sec;</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>    bucket-&gt;last_fill = <a class="code hl_function" href="qtime_8c.html#a689f608f871f45fb772266bf1f18cdd7">qtime_current_milli</a>();</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>}</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment"></span> </div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment">/**</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment"> * Consume tokens from the bucket.</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment"> *</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment"> * @param bucket tockenbucket object.</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment"> * @param tokens number of tokens to request.</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment"> *</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment"> * @return return true if there are enough tokens, otherwise false.</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment"> */</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"><a class="line" href="qtokenbucket_8c.html#aec09c4e8a1ef411e4a5ee6d9036dbca0">   93</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="qtokenbucket_8c.html#aec09c4e8a1ef411e4a5ee6d9036dbca0">qtokenbucket_consume</a>(qtokenbucket_t *bucket, <span class="keywordtype">int</span> tokens) {</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>    refill_tokens(bucket);</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>    <span class="keywordflow">if</span> (bucket-&gt;tokens &lt; tokens) {</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>        <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>    }</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>    bucket-&gt;tokens -= tokens;</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>    <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>}</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"></span> </div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">/**</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment"> * Get the estimate time until given number of token is ready.</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment"> *</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment"> * @param tokens number of tokens</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment"> *</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment"> * @return estimated milliseconds</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment"> */</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"><a class="line" href="qtokenbucket_8c.html#a5464647c7e3874f8517fdbe787ee6ce3">  109</a></span><span class="keywordtype">long</span> <a class="code hl_function" href="qtokenbucket_8c.html#a5464647c7e3874f8517fdbe787ee6ce3">qtokenbucket_waittime</a>(qtokenbucket_t *bucket, <span class="keywordtype">int</span> tokens) {</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>    refill_tokens(bucket);</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>    <span class="keywordflow">if</span> (bucket-&gt;tokens &gt;= tokens) {</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>        <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>    }</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>    <span class="keywordtype">int</span> tokens_needed = tokens - (int)bucket-&gt;tokens;</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>    <span class="keywordtype">double</span> estimate_milli = (1000 * tokens_needed) / bucket-&gt;tokens_per_sec;</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>    estimate_milli += ((1000 * tokens_needed) % bucket-&gt;tokens_per_sec) ? 1 : 0;</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>    <span class="keywordflow">return</span> estimate_milli;</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>}</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span> </div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="preprocessor">#ifndef _DOXYGEN_SKIP</span><span class="comment"></span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">/**</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment"> * Refill tokens.</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment"> */</span><span class="preprocessor"></span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="keyword">static</span> <span class="keywordtype">void</span> refill_tokens(qtokenbucket_t *bucket) {</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>    <span class="keywordtype">long</span> now = <a class="code hl_function" href="qtime_8c.html#a689f608f871f45fb772266bf1f18cdd7">qtime_current_milli</a>();</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span>    <span class="keywordflow">if</span> (bucket-&gt;tokens &lt; bucket-&gt;max_tokens) {</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>        <span class="keywordtype">double</span> new_tokens = (now - bucket-&gt;last_fill) * 0.001</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>                * bucket-&gt;tokens_per_sec;</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>        bucket-&gt;tokens =</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>                ((bucket-&gt;tokens + new_tokens) &lt; bucket-&gt;max_tokens) ?</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>                        (bucket-&gt;tokens + new_tokens) : bucket-&gt;max_tokens;</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>    }</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>    bucket-&gt;last_fill = now;</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>}</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="preprocessor">#endif </span><span class="comment">// _DOXYGEN_SKIP</span></div>
<div class="ttc" id="aqtime_8c_html_a689f608f871f45fb772266bf1f18cdd7"><div class="ttname"><a href="qtime_8c.html#a689f608f871f45fb772266bf1f18cdd7">qtime_current_milli</a></div><div class="ttdeci">long qtime_current_milli(void)</div><div class="ttdoc">Returns the current time in milliseconds.</div><div class="ttdef"><b>Definition</b> <a href="qtime_8c_source.html#l00049">qtime.c:49</a></div></div>
<div class="ttc" id="aqtokenbucket_8c_html_a5464647c7e3874f8517fdbe787ee6ce3"><div class="ttname"><a href="qtokenbucket_8c.html#a5464647c7e3874f8517fdbe787ee6ce3">qtokenbucket_waittime</a></div><div class="ttdeci">long qtokenbucket_waittime(qtokenbucket_t *bucket, int tokens)</div><div class="ttdoc">Get the estimate time until given number of token is ready.</div><div class="ttdef"><b>Definition</b> <a href="qtokenbucket_8c_source.html#l00109">qtokenbucket.c:109</a></div></div>
<div class="ttc" id="aqtokenbucket_8c_html_a8da36d9c0f027f0a24086526593e2eab"><div class="ttname"><a href="qtokenbucket_8c.html#a8da36d9c0f027f0a24086526593e2eab">qtokenbucket_init</a></div><div class="ttdeci">void qtokenbucket_init(qtokenbucket_t *bucket, int init_tokens, int max_tokens, int tokens_per_sec)</div><div class="ttdoc">Initialize the token bucket.</div><div class="ttdef"><b>Definition</b> <a href="qtokenbucket_8c_source.html#l00076">qtokenbucket.c:76</a></div></div>
<div class="ttc" id="aqtokenbucket_8c_html_aec09c4e8a1ef411e4a5ee6d9036dbca0"><div class="ttname"><a href="qtokenbucket_8c.html#aec09c4e8a1ef411e4a5ee6d9036dbca0">qtokenbucket_consume</a></div><div class="ttdeci">bool qtokenbucket_consume(qtokenbucket_t *bucket, int tokens)</div><div class="ttdoc">Consume tokens from the bucket.</div><div class="ttdef"><b>Definition</b> <a href="qtokenbucket_8c_source.html#l00093">qtokenbucket.c:93</a></div></div>
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